Stoker



Ap 20,1937. c. H. HALL ET AL STOKE-IR Filed July 9, 1932 4 Sheets-Sheet 1 a um mm m R v5 0. NMR W mmj mm April 20, 1937.

S TOKER c. H. HALL El AL 2,077,882

Filed July 9, 1932 4 SheetSn-Shet 2 I I I I I I ATTORNEY April 20, 1937.

c. H. HALLYET AL 2,077,882

STOKER Filed July 9, 1932 4 Sheets-Sheet 5 ATTORNEY April 20, 1937.

c. H. HALL El AL 2,077,882

STOKER Filed July 9, 1932 4 Sheets-Sheet 4 ATTORNEY:

Patented Apr. 20, 1937 UNITED STATES STOKER Cortice H. Hall, Glen Rock, and Frederick Lee Hilder, Clifton, N. J.,

assignors, by mesne 21S- signments, to Electric Furnace-Man, Inc., New York, N. Y., a corporation of New York Application July-9, 1932, Serial No. 621,624

14 Claims.

This invention relates to stokers and more particularly to an improvement in the mechanism for driving the fuel feed and ash remover units and for regulating the air feed to the burner. The stoker to which the present improvements are applied is of the general arrangement shown in the Hall Patent 1,762,816, but for use with a single burner.

In describing the invention reference will be made to the drawings in which Figure 1 is a front elevation with a portion of the ash elevator and a portion of the air intake cut off. Figure 2 is a plan view of the outer end of the stoker unit with the hopper and the ash elevatl5 ing mechanism omitted. Figure 3 is a section throughthe fuel conveyor shaft showing a portion of the supporting frame for the driving mechanism. Figure 4 is a detailed front elevation of the air and feed control mechanism and Figure 5 is a section on the lines 5--5 of Figure 4.

In the apparatus illustrated, the fuel is fed to the burner (not shown) through a fuel conduit by a worm feed on the shaft 1 and the ashes are removed by a similar feed on the shaft 2, as described more fully in the aforementioned patent. A motor 3 drives the shaft I through a gear reducer 4 which rotates the crank 5 and reciprocates the lever 6 through the link I. An

3 air blower 8 connected directly to the motor 3 supplies air to the burner through a conduit ,9, which communicates with the casing surrounding the burner (not shown). The intake for the blower may connect through a conduit ill with astoker hood (not shown) as described more fully in our copending application Serial Number 621,626, filed July 9, 1932 entitled Stoker hood.

' The hopper (not shown) may be supported over the opening II inthe frame 12 through which it communicates with the inlet end of a fuel conduit (not shown). The ashes drawn from the burner by the screw on the shaft 2 may be conveyed by the elevator l3, which may be of the bucket or scraper type, to a suitable receptacle.

The improved driving connection may be seen more readily by referring to Figure 3. A sleeve i4 is pinned to the shaft l by a shear pin 15.

The sprocket wheel 16, which drivesthe ash remover shaft 2 through the chain I1, is held in position upon this sleeve by the screws l8 threaded into. the shoulder 19 which is fastened to or integral with the sleeve M. The ratchet wheel 55 20, having an inwardly projecting collar 2|, may

be keyed to the sleeve M, as illustrated at 22, and the key, together with the ratchet wheel, may be held in place against the shoulder l9 by a threaded collar 23. The reciprocating lever 6 is integral with the disc 24 which surrounds and rides upon .the shoulder 2! of the ratchet wheel 20. The disc 24 also has an integral projection 25 to which the pawl 26 is pivoted.

The distance traveled by the ratchet wheel 20 and the shaft l, during a single forward stroke of the lever (i is regulated by the position of the guide 21, which guide may be moved forwardly to lift the roller 28 during any desired period of the reciprocation of the lever 6. This roller 28 rotates on a stud 29 fixed to the forward end of the pawl 26 so that the guide will raise the pawl when positioned so that the roller 28 contacts with it. A pawl 26a, pivoted-to the frame, may be used to prevent backward movement of the ratchet wheel.

The main bearing of the shaft I is illustrated at 30 and is supported in a portion 3| of the frame l2 through an adjustor plate 33 which may be fixed to the frame 3| by means of'bolts through the flange 33a. The guide 21 is integral with and projects from a collar 32 which bears upon a shoulder of the adjustor plate 33. The position of the collar 32, which is free to rotate on the shoulder of the adjustor plate 33, is determined by a lever 34 connected to the projection 35 from the collar 32 by a link 36. This lever 34 is in tegral with a collar 31 which is pivoted about the standard 38 and which may be fixed in relation thereto by the set screw 39 carrying a counterbalance weight 40.

The bearing 30 extends beyond the adjustor plate 33'to provide extended bearing surfaces upon the bushings 30a and a grease pocket 30b. A washer 30c-is positioned at the end of the bearing 30 and a collar 30d is pinned to the end of the shaft 1 by a" pin 30s. The end of the collar is provided with a squared hole 30f. The coal conveyor shaft la has a squared end 30h adapted to fit into the squared hole 30 f and may be held there by a pin 30g passing through aligned holes in the collar 30d and the squared nected to the valve through the gears 44. A pin 45 is fixed to a lever 46, fastened to the rod 43, so that a counterclockwise movement of the pin 45 about the rod 43 will open the valve 4|.

In order tocontrol the quantity of air supplied to the burner, in accordance with the rate of feed of the fuel, an adjustable plate 41, having a curved cam surface 48, is fixed to the looped frame 49 projecting from the collar 32. This cam surface may be curved so'.,that a desired opening. of the air valve will be accomplished with a given increase in fuel feed, as regulated by movement of the guide 21. But for a different\ fuel or for a different burner or fuel conveyor screw, this rate of opening may not be suitable. In order, therefore, that this control may be made adjustable for a great variety of conditions, the plate 41 is supported upon the two discs 50 and 5| which are pivotally fastened to the frame 48 at points spaced from the centers of the discs. The disc 50 has a shoulder 52 which passes through a cylindrical opening in the plate 41 and the disc 5| has a shoulder 53'which passes through an'elongated curved opening 54 in the plate 41. These shoulders extend beyond the plate 41 as illustrated at 521; and 5311, so that the plate 41 will not be clamped against the projection 49 and may be pivoted around either disc upon loosening and turning the other. To set the plate 41 in the desired position, the bolt 55 may be loosened and the disc 50 may be rotated about the bolt 55 until the desired opening of the valve 4| is obtained for the minimum feed of the condiscs due to the adjustment of the plate.

veyor, whereupon the bolt 55 may be tightened.

The bolt 56 may then be loosened and the disc 5| may be rotated about that bolt until the desired opening of the valve 4| for the maximum feed of the-conveyor screw 'is had, after which this bolt may be tightened. With the arrangement described, either end of the cam plate may be adjusted without loosening the disc at the other end. The slot 54 will take care of any' variation in the distance between the centers of the After adjusting the air control plate 41 to give the desired rate of opening, the collar 32 maybe rotated by raising or lowering the set screw 39 to position the guide 21 to give the required length ,of contact between the pawl 26 and theratchet wheel 20 to rotate the shaft I through the desired distance for each reciprocation of the lever B. The set screw may then be set for this position and the motor may be started to feedfuel and air to the burner. If it is desired to increase-the rate of feed, the 'set screw 39 may be loosened and lifted to throw the guide 21 to the left and so give greater contact between the pawl 25 and the ratchet wheel. This will automatically increase the air supply through the cam surface 48.

A pointer 51 may be conveniently attached to the rod 43 or the lever 46 and an index 53 may 'Be fixed to the frameto indicate the rate of air feed. Any adjustment-in the rate of opening of the air valve that may become necessary may be made by rotating the discs 50 and 5| as hereinbefore described. A single embodiment of the invention has been described, but it is not intended to thereby limit it tothe particular construction shown or to use with the particular device described, it being all equivalents thereof be included within the scope of the appended claims.

What we claim is: v

'1. An adjustable cam comprising a movable member, a pair of discs pivotally mounted on said member for eccentric movement with respect to the centers of said discs, a cam plate mounted on said member, said discs having shoulders passing through openings in said plate, whereby upon rotation of one or both of said discs, the cam plate is adjusted relative to said member.

2. A cam as defined in claim 1, in which the shoulder of one of said discs passes through an elongated curved opening in said plate.

3. A cam as defined in claim 1, in which the sho der of one of said discs passes through an elongated curved opening in said plate and the shoulder of tlie other disc, passes through a cylindrical opening\in said plate. 1

4. A cam as defined in claim 1, in which the shoulders of said discs extend beyond the surfaces of said cam plate to space the plate from its supporting member.

5. A collar adapted to be rotatably mounted on a shaft, two discs rotatably mounted on said 001- lar for eccentric movement with respect to their own geometric centers, and a cam plate mounted on said collar in contact with the sides of said discs elongated aperture is provided in said cam plate to permit one of said discs to move longitudinally of the plate.

'1. In combination with a stoker mechanism comprising means for feeding fuel to a burner,

means for feeding a combustion supporting gas to the burner, a rotatable regulator for regulating said fuel feeding means, and means for regulating the supply of the said gas to the burner, a device for correlating the rate of feed of fuel with the rate of feed of the combustion supporting gas comprising a cam, actuated by said rotatable regulator, for increasing the feed of said gas with increased feed of fuel, and means for varying the distance of an end portion of said cam from the center of rotation of said rotatable regulator without substantially altering the distance of the other end portion of the cam from said center of rotation.

8. In combination with a stoker mechanism comprising means for feeding fuel to a burner, means for feeding a combustion supporting gas to the burner, a rotatable regulator for regulating said fuel feeding means, and means for regulating the supply of the said gas. to the burner, a

device for correlating the rate of feed of fuel with the rate of feed of the combustion supporting gas comprising a cam, actuated by said rotatable re ulator, for increasing the feed of said gas with increased feed of fuel, and means for varying the distance of the cam surface from the center of rotation of said rotatable regulator to change the rate of gas feed at one end of the range of rates of fuel feed without substantially altering the rate of gas feed at the other end of the range of rates of fuel feed. a

9. An adjustable regulator comprising a movable member adapted to move in a given path, a pair of disc-shaped members pivotally mounted on said movable member for eccentric movement with respect to the centers of said disc-shaped members, a cam mounted on said movable member in contact with said disc-shaped members, whereby upon rotation of one or both of said disc- 6. Adevice as defined in claim 5 in which an r shaped members said cam is adjustedrelative to the path of movement of said movable member.

10. An adjustable regulator comprising a movable member adapted to move in a given path, a 5 cam member, ,a circular member in contact with said cam member and pivotally mounted on said movable member for eccentric movement with respect to the center of the circular member, and means mounted on said movable member in con- 10 tact with said cam member, said members and means being so constructed and arranged that upon rotation of said circular member, said cam member may be adjusted in a direction transverse to the path of movement of said movable 1 member.

11. A cam as defined in claim 1 in which the shoulder of at least one of the discs isprovided with means for retaining the cam plate in mounted position on the movable member.

12. A cam as defined in claim 1 in which the shoulders 01. the discs extend beyond the surfaces of said cam plate and space the plate from its supporting member and the shoulders of the discs fit closely within the openings in said plate.

13. An adjustable regulator as defined in claim 10 inwhich the circular member maintains the a cam member in mounted position on the movable member.

14. A combination as defined in claim 8 in which each end of the cam surface is adjustable to change the rate of gas feed with respect to the rate of fuel feed.

CORTICE H. HALL. 'FREDERICKWLEE HILDER. 

